Chem exam 1

The atomic mass for Sodium is: A. 22.989770 B. 16 C. 11 D. 32.066

A. 22.989770

Which of the following is an example of a scientific theory? A. All matter is composed of small, indestructible particles called atoms. B. Flammable objects contain phlogiston. C. In a chemical reaction, matter is neither created nor destroyed. D. When a can of soda pop is opened, a fizzing sound is heard. E. none of the above

A. All matter is composed of small, indestructible particles called atoms.

Which of the following elements has the highest ionization energy? A. Ne Incorrect B. Ba C. Ca D. Al E. Cl

A. Ne

What is the electron configuration for P? A. [Ne]3s23p3 B. [Ar]3s23p3 C. [Ne]1s21p62s22p3 D. [Ar]3s23p64s23d104p 3 E. none of the above

A. [Ne]3s23p3

What is the name of Ca(NO3)2? A. calcium nitrate B. calcium nitride C. calcium nitrite D. calcium dinitrite E. none of the above

A. calcium nitrate

Which of the following items does not contain chemicals? A. drain cleaner B. air C. insecticides Incorrect D. organically grown vegetables E. All of the above contain chemicals.

All of the above contain chemicals.

How many significant digits should be reported in the answer to the following calculation? (4.3 - 3.7) x 12.3 = A. 3 B. 1 C. 2 D. 4 E. none of the above

B. 1

The atomic numer for Potassium is: A. 30.97 B. 19 C. 39.0983 D. 15

B. 19

Which of the following elements has only 12 protons? A. Zn B. Mg C. C D. O E. none of the above

B. Mg

All of the following statements about different elements are true EXCEPT: A. Krypton is one of the noble gases. Correct B. Sulfur is considered a metalloid. C. Barium is an alkaline earth metal. D. Manganese is a transition metal. E. Iodine is a halogen.

B. Sulfur is considered a metalloid.

How many electrons are unpaired in the orbitals of carbon? A. 6 B. 4 C. 2 D. 12 E. none of the above

C. 2

A carbon atom has _______ valence electrons A. 11 B. 10 C. 4

C. 4

What is the formula for an ionic compound made of magnesium and sulfur? A. MgS2 B. Mg2S3 C. MgS D. Mg2S Incorrect E. none of the above

C. MgS

Given the following list of densities, which materials would float in a molten vat of lead provided that they do not themselves melt? Densities (g/mL): lead = 11.4, glass = 2.6, gold = 19.3, charcoal = 0.57, platinum = 21.4. A. gold and platinum B. gold and charcoal C. glass and charcoal D. gold, platinum, glass and coal E. none of the above

C. glass and charcoal

Group 7A elements are also called: A. noble gases. B. alkali metals. C. halogens. D. alkaline earth metals. E. none of the above

C. halogens.

Group 8A elements are also called: A. alkali metals. B. alkaline earth metals. C. noble gases. D. halogens. E. none of the above

C. noble gases.

What is the formula for an ionic compound made of carbon and oxygen?

Carbon and oxygen do not form an ionic compound.

How many milliliters are in 17.5 L? A. 1.75 x 103 B. 175 C. 1.75 x 10-2 D. 1.75 x 104 E. none of the above

D. 1.75 x 104

Which of the following is an example of a scientific law? A. When a can of soda pop is opened, a fizzing sound is heard. B. Flammable objects contain phlogiston. C. All matter is composed of small, indestructible particles called atoms. Correct D. In a chemical reaction, matter is neither created nor destroyed. E. none of the above

D. In a chemical reaction, matter is neither created nor destroyed.

How are wavelength and frequency of light related? A. Wavelength increases as frequency increases. B. Wavelength is one-half of the frequency. C. Wavelength is independent of frequency. D. Wavelength increases as the frequency decreases. E. Wavelength is double the frequency.

D. Wavelength increases as the frequency decreases.

Which of the following is an example of an observation? A. Reactions occur due to the transfer of electrons. B. Flammable objects contain phlogiston. C. All matter is composed of small, indestructible particles called atoms. Correct D. When a can of soda pop is opened, a fizzing sound is heard. E. none of the above

D. When a can of soda pop is opened, a fizzing sound is heard.

A good definition of chemistry is: A. the science that seeks to understand what living organisms do by studying the molecules that make up the organism. B. the science that seeks to understand what the universe does by studying interactions of molecules with atoms. C. none of the above D. the science that seeks to understand what matter does by studying what atoms and molecules do. E. the science that seeks to understand the interactions of molecules for the sake of advancing human control over nature.

D. the science that seeks to understand what matter does by studying what atoms and molecules do.

What is the electron configuration for Kr? A. 1s22s22p63s23p24s 23d104p6 B. 1s22s22p63s23p64s 23d24p6 C. 1s22s22p63s23p43d 104s24p6 D. none of the above E. 1s22s22p63s23p64s 23d104p6

E. 1s22s22p63s23p64s 23d104p6

What is the correct formula for a potassium ion with 18 electrons?

K+

What is the atomic symbol for tin?

Sn